来自《耶鲁大学开放课程：博弈论 第9集 第9集》

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  So notice that we can think of pure strategies
  因此大家可以把纯策略
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  as the special case of a mixed strategy
  看成是一种特殊的混合策略
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  that assigns all the weight to a particular pure strategy.
  即该混合策略赋予某纯策略以概率1
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  So, for example, if Pi(R) was 1,
  例如如果Pi(R)=1
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  that's equivalent to saying that
  它实际上表示的意思是
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  I'm playing the pure strategy rock, i.e. a pure strategy.
  我只出石头 其实是个纯策略
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  So there's nothing here.
  至此我们没讲什么实质性的东西
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  I'm just being a little bit nerdy about developing notation
  我们只不过讲了些无聊的表示法
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  and making sure that everything is in place,
  并确保为接下来的内容做好准备
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  and just to point out again,
  另外我再强调一点
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  one consequence of this is we've now got our pure strategies
  我们可以把纯策略看成是
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  embedded in our mixed strategies.
  一种特殊的混合策略